Water heating apparatus



Aug. 22, 1944. R. B. DAvls WATER HEATING APPARATUS Filed May s, 194:5

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BY M" HIS' ATTORNEYS Patented Aug. 22, 1944 UNITED- STATES PATENT YlOFFICE I Y 2,356,657 y WATER HEATING APPARATUS Ralph B. Davis,Prestonsburg, Ky. Application May-6, 1943, serial No. 485,922 v sclaims. (c1. 12a- 16) i* I v This invention relates to improvements inwater heating apparatus. -f

The primary object of the invention is to provide a stand boiler with awater heating apparatus or attachment which will operate with maximumefficiency in maintaining a supply of hot water in thelboiler.

Another object is to provide a water heating apparatus or attachment forstand boilers in which a gas burner is used for heating a series ofwater coils which are connected to the water Supply and to the standboiler in an arrangement that will produce maximum eiiciency in theheating of the water and in the maintenance of a supply of hot water inthe boiler.

More particularly, the invention contemplates a water heating apparatuswherein the water is preheated in one water coil and primarily heated ina second water coil, the water from the preheating coil being dischargedinto the stand boiler at a point in close proximity to the point atwhich the intake of the primary heating coil is located.

With these and other objects in view, the invention consists in certainnovel details of construction and combinations and arrangements ofparts, all as will hereinafter be more fully described and the novelfeatures thereof particularly pointed out in the appended claims.

In the accompanying drawing,

Figure 1 is a sectional view taken longitudinally of a stand boilerillustrating the preferred embodiment of the present invention; and

Fig. 2 is a similar view illustrating a modified form of the invention.

In Fig. 1, the stand boiler I is of tubular formation, having a ue II ofuniform cross-section extending axially thereof which constitutes apassage for products of combustion from the gas burner I2 mounted in anysuitable manner adjacent the lower end of said flue. Immediately aboveburner I2, there is mounted in flue II a water coil I3 which is termedthe primary heating coil, as the water passing therethrough absorbs themajor portion of the heat from the burner. The intake or lower end I4 ofthis primary heating coil is located adjacent the lower end of the standboiler, and said coil discharges into the upper end of the boiler, anextension I5 being provided on the upper end of the coil proper for thispurpose.

Also mounted in the flue I I, at a point above the primary coil I3, iswhat is termed the preheating coil I6. Water from a source of supplyenters the upper end of this coil and is discharged from the lower endthrough an extension I6a whichtermnates at a point or level within theboiler which substantially corresponds tothe level at whichv the intakeI4 of the located. l l

With this arrangement ofthe heating coils I3 and I 6, the maximumheating eiect of burner I2 will be obtained by reason of the fact' thata great deal of heat that would ordinarily be lost is absorbed by thewater in the upper water coil I6. The provision of this preheating coilI6 has the further advantage of preventing water entering the boiler atthe temperature of the water in the service line. This, of course,increases the eiliciency of the boiler and of the heating apparatus as awhole. Furthermore, the preheated water is discharged from coil I6 intothe lower portion of the boiler from which coil I3 draws its supply, sothat the water, heated to a higher temperature in the top portion of theboiler, is less likely'to be aiected by the incoming water which is oflower temperature. Thus, when hot water is drawn from the boiler throughthe outlet I 'I in the top ol said boiler, water will flow from thelower portion ofthe boiler into primary heating coil I4 which will, atthe same time, be emptying hot water into the upper end of the boiler,anda fresh increment of water will flow into the preheating coil I6 asthe latter empties water which has been heated to some. extent into thebottom of the boiler. As stated, this particular arrangement of the twocoils greatly increases the efficiency of the boiler, not only by reasonof the absorption of a major portion of the heat from burner I2, butalso by reason of the specific manner in which the water is circulatedthrough the coils and boiler.

If desired, an adjustable closure I8 may also be provided at thedischarge end of ue I I to conserve the heat from burner I2 and slightlyincrease the efficiency of the apparatus.

In the form of apparatus illustrated in Fig. 2, the coils I3, I6, andburner I2, are housed in flue or passage IIa located exteriorly of theboiler I!) and preferably covered with heat insulating material I9. Inthis arrangement, the fresh supply of water enters preheating coil I6 atthe bottom thereof and the upper end of said coil is provided with anextension I6a which terminates in the lower portion of the stand boiler.As in the previously described arrangement of Fig. l, the primary waterheating coil I3 of this modification draws water from the bottomporprimary heating coil I3 is tion of the boiler and discharges into theupper end of said boiler.

What I claim is:

1. In a water heating apparatus for standV boilers, the combination of astand boiler having a vertical ilue of uniform cross-section eX- tendingtherethrough, a gas burner located in the lower end of said ue, apreheating water coil located entirely within said flue, said coilhaving its supply end located at the upper end of the flue, a dischargeconnection at the lower end of said coil terminating in the lowerportion of the stand boiler, a primary water coil located entirelywithin said ue intermediate said preheating coil and said burner, theintake of said primary coil being connected to the flue at the lower endthereof and the discharge of said primary coil being connected to theupper end only of the flue, and a discharge.connection in the Lipper endof said boiler.

2. In a water heating apparatus for stand boilers, the combination of astand boiler having a vertical flue extending therethrough and mediatesaid burner and said preheating coil, the intake and outlet of saidprimary coil being connected to the lower and upper portions,respectively, of said ue, and said boiler having a discharge outlet inits upper portion, said discharge outlet being the sole means ofsupplying Water from said boiler.

3. In a water heating apparatus for stand boilers, the combination of agas burner having a vertical flue of uniform cross-section associatedtherewith for products of combustion, a preheating water coil to whichwater to be heated is supplied, said coil being located entirely withinsaid flue and said coil having a discharge located in the lower portionof the boiler, a primary water coil located entirely within said flueintermediate said preheating coil and said burnv er, the intake of saidprimary coil being connect-

